What is CVE-2017-18193?

CVE-2017-18193 is a medium-severity vulnerability in Linux Kernel, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 5.5/10. Published 2018-02-22.

How severe is CVE-2017-18193?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Buffer overflow in Linux Kernel

CVE-2017-18193

fs/f2fs/extent_cache.c in the Linux kernel before 4.13 mishandles extent trees, which allows local users to cause a denial of service (BUG) via an application with multiple threads.

Vulnerability class: Buffer Overflow

Published 2018-02-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.004 (28.8th percentile), scored 2026-10-06.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 29th percentile — 28.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Linux Kernel

Weakness classification (CWE)

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer

References

git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/ (Patch)
usn.ubuntu.com/3654-1/ (vendor-advisory)
github.com/torvalds/linux/commit/dad48e73127ba10279ea33e6dbc8d3905c4d31c0 (Patch, Vendor Advisory)
www.debian.org/security/2018/dsa-4188 (vendor-advisory)
www.securityfocus.com/bid/103147 (VDB Entry, Third Party Advisory, vdb-entry)
usn.ubuntu.com/3654-2/ (vendor-advisory)
usn.ubuntu.com/3656-1/ (vendor-advisory)

Frequently asked questions

What is CVE-2017-18193?: CVE-2017-18193 is a medium-severity vulnerability in Linux Kernel, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 5.5/10. Published 2018-02-22.
How severe is CVE-2017-18193?: Medium severity. CVSS v3 base score is 5.5 out of 10.